CN101200142A - Element substrate, printhead, head cartridge, and printing apparatus - Google Patents
Element substrate, printhead, head cartridge, and printing apparatus Download PDFInfo
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- CN101200142A CN101200142A CNA2007101620976A CN200710162097A CN101200142A CN 101200142 A CN101200142 A CN 101200142A CN A2007101620976 A CNA2007101620976 A CN A2007101620976A CN 200710162097 A CN200710162097 A CN 200710162097A CN 101200142 A CN101200142 A CN 101200142A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17543—Cartridge presence detection or type identification
- B41J2/17546—Cartridge presence detection or type identification electronically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04523—Control methods or devices therefor, e.g. driver circuits, control circuits reducing size of the apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04525—Control methods or devices therefor, e.g. driver circuits, control circuits reducing occurrence of cross talk
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04541—Specific driving circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0458—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/1752—Mounting within the printer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17526—Electrical contacts to the cartridge
- B41J2/1753—Details of contacts on the cartridge, e.g. protection of contacts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17553—Outer structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
The invention relates to an element substrate which can confirm the electric connection state before any false operation of a printing head. The element substrate is applicable to a printing head which can be demounted from a printing device, and the printing head comprises a plurality of printing elements; a voltage stressing terminal for stressing a driving voltage and driving the printing elements; and a logic circuit which can be driven by a voltage which is lower than the driving voltage to control the printing elements. The logic circuit is driven by a voltage which is lower than the driving voltage. The element substrate comprises a connection state output circuit which reflects the signal of the electric connection state between the printing head and the printing device based on the output of the voltage stressed by the voltage stressing terminal.
Description
Technical field
The present invention relates to a kind of printing head component substrate with connection status output circuit, the signal of status of electrically connecting the invention still further relates to printhead, a box and printing equipment between this connection status output circuit output reflection printhead and the printing equipment.
Background technology
Inkjet-printing device is the so-called non-printer that impacts, and can carry out printing and almost muting printing on flying print, the various print media.Owing to these reasons, inkjet-printing device is widely used as the device as the printing mechanism of printer, duplicator, facsimile machine or word processor.
The known typical black discharge method that printhead adopted in the inkjet-printing device for example is to use the method such as the method for the electromechanical transducer of piezoelectric element and use electrothermal transducer (heater), and electrothermal transducer heats to discharge ink droplet by film boiling effect (film boilingeffect) ink.
Printing equipment with this ink jet-print head can be exported high-resolution character and image with low cost.Specifically, the printer of discharging ink droplet by the film boiling effect occupies the very big market share, because it can carry out colour print with low cost.
The quantity in the hole of printhead is increased to 128 or 256 along with the more and more higher trend of picture quality from 64.The quantity in hole (dpi) is increased to 300dpi or 600dpi on the per inch, and arrange with high density in the hole.When to receive the order of magnitude be a few μ sec to the thermal pulse of 10 μ sec, form bubble as the heater of electrothermal transducer corresponding to what arranged in each hole by film boiling.This high-frequency driving has realized at a high speed, high-quality printing.
The unit that is used for being electrically connected the inkjet-printing device printhead is set at the balladeur train that reciprocally moves the printhead that is connected.Specifically, balladeur train has a plurality of contacts.When printhead was connected to balladeur train, these contacts contacted with a plurality of contacts that are arranged on the printhead side.This has guaranteed being electrically connected between printhead and the inkjet-printing device.
U.S. Patent No. 5828386 discloses a kind of printhead with the unit that is used to monitor status of electrically connecting.Specifically, this printhead comprises "AND" circuit and output, this "AND" circuit calculate from printing equipment be input to printhead print data, be used to transmit the clock signal of this print data and be used to make this device to carry out corresponding to the logical produc between the logical signal of the printing of this print data, this output is exported result of calculation.This design has prevented the so any misprint of printhead maloperation beat print point or caused by contact fault such as lacking.This unit that is used for confirming connection status is particularly important at the printhead of the integrated ink container that can dismantle from the ink-jet printer main body.
In the prior art, after the contact condition of the terminal of confirming to be used for RL signal (for example print data, clock signal and control signal) is normal, the high voltage of for example 24V is applied to printhead.If these short-circuits of terminals perhaps receive high-tension circuit pack and have connection error, even then the contact condition of terminal looks like normally, printhead also may maloperation.
Summary of the invention
The present invention relates to device substrate, printhead, a box and printing equipment.
The present invention makes in order to address the above problem.An object of the present invention is to provide a kind of printing head component substrate, this printing head component substrate can be exported the signal whether voltage that reflection expression is used to drive type element normally is applied to the status of electrically connecting of printhead.Another object of the present invention provides a kind of printing head component substrate, and it can reflect the signal of status of electrically connecting between printing equipment and the printhead in output before the printhead maloperation.
According to an aspect of the present invention, preferably provide a kind of device substrate that is used for printhead, this printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply driving voltage to drive type element; And logic circuit, this logic circuit is driven with the voltage that is lower than driving voltage, and with the control type element, this device substrate comprises:
The connection status output circuit, it is based on the signal that applies status of electrically connecting between voltage output reflection printhead that end applies and the printing equipment from voltage.
According to a further aspect in the invention, preferably provide a kind of printhead that comprises device substrate, this printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply driving voltage to drive type element; And logic circuit, this logic circuit is driven with the voltage that is lower than driving voltage, with the control type element,
This device substrate comprises:
The connection status output circuit, it is based on the signal that applies status of electrically connecting between voltage output reflection printhead that end applies and the printing equipment from voltage.
In accordance with a further aspect of the present invention, preferably provide a kind of box, have the ink container that contains ink and the printhead that comprises device substrate, this printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply driving voltage to drive type element; And logic circuit, this logic circuit is driven with the voltage that is lower than driving voltage, with the control type element,
This device substrate comprises:
The connection status output circuit, it is based on applying the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment.
According to a further aspect in the invention, preferably provide a kind of printing equipment, its use comprises the printhead of device substrate, and this printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply driving voltage to drive type element; And logic circuit, this logic circuit is driven with the voltage that is lower than driving voltage, and with the control type element, this printing equipment comprises:
Input unit, be used to import the signal of being exported from the connection status output circuit, and when applying end from voltage when applying voltage to printhead, based on apply the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment, wherein this connection status output circuit is arranged on the device substrate;
Determine device, be used for determining to be electrically connected based on the signal that is input to input unit;
Control device is used for determining to control under the unusual situation of status of electrically connecting at definite device, makes to stop to apply voltage to printhead before surpassing the breakdown voltage of logic circuit from the voltage that printing equipment applied.
The present invention is highly beneficial, can apply when being used to drive the voltage of type element the printing head component substrate of the signal of status of electrically connecting between output reflection printing equipment and the printhead, and cheap and printhead reliably because it can provide a kind of.
Other features of the present invention will become more obvious from following (with reference to accompanying drawing) description to exemplary embodiment.
Description of drawings
Fig. 1 is the circuit diagram that illustrates according to the circuit design of inkjet printing head element substrate of the present invention;
Fig. 2 is the flow chart that illustrates according to the sequence of connection status in the affirmation inkjet-printing device of the present invention;
Fig. 3 A and 3B are respectively the sequential charts that is connected the circuit diagram of confirming circuit and the sequential that is used to confirm connection status is shown that illustrates as characteristic features of the present invention;
Fig. 4 A and 4B are the perspective views of explaining according to first printhead of the embodiment of the invention;
Fig. 5 is the decomposition diagram that illustrates according to first printhead of the embodiment of the invention;
Fig. 6 illustrates the perspective view that cuts away according to the part that is included in first device substrate in first printhead of the embodiment of the invention;
Fig. 7 is the schematic diagram that illustrates according to inkjet-printing device example of the present invention;
Fig. 8 is the block diagram that illustrates according to the control design of inkjet-printing device of the present invention.
The specific embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
In specification, term " printing " not only comprises formation such as character and the so significant information of figure, form image, picture, pattern or the like on the print media but also broadly be included in, perhaps also comprise processing to medium, and no matter whether these things meaningful, also no matter whether they visual so that can be seen by naked eyes.
And term " print media " not only comprises employed paper in the common printing equipment, but also broadly comprises the material that can accept ink, such as cloth, plastic foil, metallic plate, glass, pottery, timber and leather.
In addition, term " China ink " (below be also referred to as " liquid ") should be similar to above-mentioned definition to " printing " and broadly explained like that.That is to say, can form image, picture, pattern or the like when " China ink " comprises on being applied to print media, can handle print media and can handle ink (for example can make be included in the ink that is applied to print media have toner to solidify or soluble) liquid.
" device substrate " in the specification is not meant the simple substrate of being made by silicon semiconductor, but expression has the substrate of element and wiring.
Word " on device substrate " is not only represented " on the surface of device substrate ", and expression " close its surface in device substrate ".Term among the present invention " built-in " is not expression " arranging independently element simply on substrate ", but " in the semiconductor circuit manufacture process, on device substrate, being formed integrally as and making element ".
Fig. 4 A to Fig. 6 is used to explain the figure that uses or implement suitable printhead (box) of the present invention.Below with reference to these figure the configuration element is described.
The printhead of this embodiment is the printhead that is integrated with the ink container type that comprises ink.Printhead comprises the first printhead H1000 that black ink is housed, shown in Fig. 4 A and 4B, and the second printhead H1001 (not shown) that color inks (cyan, magenta red ink and yellow ink) is housed.These printheads H1000 and H1001 are fixed by positioning unit and electric contact and are supported on the balladeur train of inkjet-printing device.These printheads can disassemble from balladeur train.Each printhead ink therein is consumed when finishing and can changes.
Describe the configuration element of printhead H1000 and H1001 below in detail.
(printhead)
The first printhead H1000 and the second printhead H1001 are to use bubble ink-jet (bubble-jet) the printhead of electrothermal transducer, and wherein electrothermal transducer produces heat energy to cause the film boiling in the ink according to the signal of telecommunication.They are so-called side thermal (side-shooter) printheads, and it comprises the electrothermal transducer relative with the hole.
The first printhead H1000 has identical essential structure with the second printhead H1001, below the main first printhead H1000 that describes.
(1-1) the first printhead H1000
Fig. 5 is the decomposition diagram of the first printhead H1000.The first printhead H1000 comprises the first type element substrate H1100, electric wire band (electrical wiring tape) H1300, ink supply keeper H1500, filter H1700, blotter H1600, cover piece (lid member) H1900 and seal H1800.
(1-1-1) the first type element substrate H1100
Fig. 6 is the perspective view that is used to explain that the part of the first type element substrate H1100 is cut away.For example the anisotropic etching of the crystal orientation by utilize using sandblast or Si forms ink supply port H1102 and prepares the first type element substrate H1100 for the long trough through hole as ink channel in 0.5 to 1mm thick Si substrate H1110.
Si substrate H1110 has electrothermal transducer H1103 array on each side of ink supply port H1102.Si substrate H1110 also has the electric wire (not shown) of for example being made by Al, and powers to electrothermal transducer H1103.Can use existing film formation technology to form electrothermal transducer H1103 and electric wire.The electrothermal transducer H1103 of these two arrays is interlaced with each other.That is to say that the hole of these two arrays is offset slightly each other, from rather than come on the line perpendicular to array direction.
Si substrate H1110 also has to line powered or is provided for driving the electrode section H 1104 of the signal of telecommunication of electrothermal transducer H1103.Electrode section H 1104 is arranged along the side at the place, two ends that is positioned at each electrothermal transducer H1103 array.For example the projection H1105 that is made by Au is formed on each electrode section H 1104.
Form with memory element, such as wiring and the pattern of resistive element by photoetching on the surface of Si substrate H1110 and to be formed from a resin and to have a structure corresponding to the ink channel of each electrothermal transducer H1103.This structure has ink channel wall H1106 that divides ink channel and the top wall portion that covers ink channel.Hole H1107 is formed in the top wall portion.Hole H1107 is relative with electrothermal transducer H1103 respectively, thereby forms hole group H1108.
In having the Si substrate H1110 of said structure, ink is provided from ink supply port H1102, and is discharged from from the hole H1107 relative with electrothermal transducer H1103 by the pressure in bubbles that heat produced that is produced by electrothermal transducer H1103.
(1-1-2) electric wire band H1300
Electric wire band H1300 forms electrical signal path, and being used for provides the signal of telecommunication of discharging ink to the first type element substrate H1100.Obtain electric wire band H1300 by on the polyimide matrix material, forming the Copper Foil wiring pattern.Electric wire band H1300 has the opening portion H1303 that is used for installing (fit) first type element substrate H1100.Near the edge of opening portion, form the electrode terminal H1304 of the electrode section H 1104 that will be connected to the first type element substrate H1100.Electric wire band H1300 also has external signal input H1302, to receive the signal of telecommunication from agent set.External signal input H1302 is connected by continuous Copper Foil wiring pattern with electrode terminal H1304.
By with ultrasonic thermocompression in conjunction with (ultrasonic thermocompression bonding) with the electrode terminal H1304 that the protruding H1105 of the first type element substrate H1100 is electrically connected to electric wire band H1300, guarantee the electrical connection between the electric wire band H1300 and the first type element substrate H1100.
(1-1-3) ink supply keeper H1500
As shown in Figure 5, have and be used for that ink is remained on ink supply keeper H1500 interior and that produce the blotter H1600 of negative pressure and have the function of ink container.The ink supply keeper H1500 that is formed for ink is guided to the ink channel of the first type element substrate H1100 also has the ink feed function.
Be used to prevent that dust from invading the filter H1700 of the first type element substrate H1100 and being soldered to boundary member between ink channel and the such part, promptly in this part, provide ink from the blotter H1600 that is positioned at the ink channel upstream.
Be used for providing the ink supply port H1200 of black ink to be formed on the downstream of ink channel to the first type element substrate H1100.In order to allow the ink supply port H1102 of the first type element substrate H1100 be communicated with the ink supply port H1200 of ink supply keeper H1500, the first type element substrate H1100 is by combination accurately and be fixed to ink supply keeper H1500.
Flat surfaces around the combined surface of the first type element substrate H1100 and the bottom surface section of electric wire band H1300 are combined and fixing by adhesive.Electrical connections between the first type element substrate H1100 and the electric wire band H1300 is by the first sealed compound H1307 and second sealed compound H1308 sealing, thereby the protection electrical connections is avoided physical impact or corrosion that ink caused.The reverse side of the coupling part between the electrode terminal H1302 of the main sealed electrical tape of first sealed compound H1307 H1300 and the protruding H1105 of the first type element substrate H1100 and the periphery of the first type element substrate H1100.The second sealed compound H1308 seals the front of above-mentioned coupling part.The not bound fraction of electric wire band H1300 is bent and for example by being attached to almost fixing perpendicular to the side surface on the combined surface of the first type element substrate H1100 of ink supply keeper H1500.
(1-1-4) cover piece H1900
Cover piece H1900 is soldered to the upper shed part of ink supply keeper H1500, with sealing ink supply keeper H1500.Cover piece H1900 has narrow port H1910, is used for alleviating the pressure variation of ink supply keeper H1500, also has the minor groove H1920 that is communicated with this narrow port H1910.Seal H1800 covers the major part of narrow port H1910 and minor groove H1920, just except the end of minor groove H1920, thereby forms air communication port H1924.Cover piece H1900 has mate H1930, is used for first printhead is fixed to inkjet-printing device.
(1-2) the second printhead H1001
The second printhead H1001 discharges three kinds of color inks: cyan, magenta and yellow ink.
Describe in detail below above-mentioned printhead is connected to inkjet-printing device.
Shown in Fig. 4 A, the first printhead H1000 has the guide rail of connection H1560, is used for printhead is guided to the link position of the balladeur train of inkjet-printing device main body.The first printhead H1000 also has mate H1930, is used for by head thick stick (head set lever) being set printhead is fixed to balladeur train.The first printhead H1000 also has butted part (butt portion) H1570, the butted part H1580 in the print media transmission direction on the balladeur train scanning direction and ink and discharges butted part H1590 on the direction, is used for printhead is navigated to the predetermined link position of balladeur train.By these butted parts location just make can with the external signal input terminal H1302 on the electric wire band H1300 accurately be arranged on balladeur train in the pin that contacts of electric connecting part electrically contact.The second printhead H1001 connects according to the mode identical with the first printhead H1000.
＜inkjet-printing device 〉
Describe below and to discharge printing equipment in conjunction with the liquid of above-mentioned box type print head.Fig. 7 be illustrate according to of the present invention can be in conjunction with the key-drawing of the printing equipment example of ink jet-print head.
With reference to Fig. 7, printing equipment has balladeur train 102, and wherein Fig. 4 A is connected replaceably with the second printhead H1001 (not shown) with the first printhead H1000 shown in Fig. 4 B and navigates to balladeur train 102.Balladeur train 102 has electric connecting part, is used for applying end by logic signal input end on printhead H1000 and the H1001 and driving voltage and transmits logical signal and driving voltage to deliverying unit.
When feeding motor 135 makes pick-up roller 131 rotation by gear, one by one separate and be fed with automatic paper feeder (ASF) 132 such as printing paper or the such print media 108 of plastic board.When transfer roller 109 rotations, print media 108 is transferred by the position (print unit) relative with the hole surface of printhead H1000 and H1001.The driving of LF motor 134 is sent to transfer roller 109 by gear.When print media 108 during, determine whether to exist print media feeding and detection position, paper top through no paper sensor (paper end sensor) 133.No paper sensor 133 also is used to detect the physical location at the tail end edge of print media 108, and finally specifies current print position based on this actual tail end marginal position.
The platform (not shown) is supported the reverse side of print media 108, so that form smooth print surface in print unit.In this case, remain connected to the printhead H1000 and the H1001 of balladeur train 102, their hole surface stretched out from balladeur train 102 downwards, and be parallel to two groups of transfer rollers between print media 108.
Printhead H1000 and H1001 are connected to balladeur train 102, make the scanning direction of the hole array direction of each deliverying unit perpendicular to balladeur train 102 simultaneously.The hole array is discharged the liquid that is used to print.
When using structure and printhead that contain shallow magenta, light cyan and black ink identical with printhead H1001 to replace printhead H1000, printing equipment can be used as the high-quality photo printer.
＜control structure 〉
The control structure of the printing control that is used to carry out above-mentioned inkjet-printing device is described below.
Fig. 8 is the block diagram of structure that the control circuit of inkjet-printing device is shown.
With reference to Fig. 8, the interface of Reference numeral 1700 expression input print signals; 1701 expression MPU; The ROM of the control program that 1702 expression storages will be carried out by MPU 1701; The DRAM of 1703 expression store various kinds of data (for example will offer print signal and the print data of printhead H1000 and H1001).The print data supply that gate array (G.A.) 1704 control is carried out to printhead H1000 and H1001, and the transfer of data between interface 1700, MPU 1701 and the RAM1703.Tray motor 1710 is carried printhead H1000 and H1001.LF motor 134 is carried print media.Head driver 1705 drives printhead H1000 and H1001.Motor driver 1706 drives LF motor 134.Motor driver 1707 driven bracket motors 1710.LED 1708 is set to for example by the luminous electrical connection mistake of notifying.
Below with the operation of description control structure.When print signal was imported into interface 1700, print signal was converted into print data, was used for printing between gate array 1704 and MPU 1701.Motor driver 1706 and 1707 is driven.In addition, drive printhead H1000 and H1001, print so that carry out according to the print data that sends to head driver 1705.
[embodiment]
Fig. 1 is the circuit diagram that illustrates according to the circuit structure of the printhead H1001 of the embodiment of the invention.Notice that the first type element substrate H1100 has by semiconductor processes and is formed on semiconductor element and wiring on the Si substrate H1110.The printhead H1001 of this embodiment has n nozzle for the every array of ink supply port H1102.Be provided with the electrothermal transducer H1103 of the type element that acts on the ink in the heated nozzle and the driving element piece H1116 that is used to drive electrothermal transducer H1103 corresponding to each nozzle.Each driving element piece H1116 has such as the such driver element H1127 of power MOS transistor, with acting on the driving element that drives respective electrical thermoconverter H1103.Each driving element piece H1116 also has level translator H1128, and it makes the grid voltage of driver be higher than the voltage (being generally 3.3V) of logic circuit, to improve the ability of driver.The voltage that is input to level translator H1128 is identical with the driving voltage (VH, for example 24V) that is used to drive electrothermal transducer H1103.Voltage is applied to VHT terminal H1125 from inkjet-printing device, to drive the power MOS transistor as driving element.For example because the breakdown voltage among the level translator H1128, by utilization be arranged in the device substrate electric resistance partial pressure or by providing buffer to reduce this voltage (approximately 14V).
Electrothermal transducer, driving element and ink discharge nozzle are collectively referred to as print member.
Printhead H1001 have be used to the clock signal input terminal H1120 that imports the print data input H1121 of print data (DATA) and be used for input clock (CLK) as with the electrically contacting of printing equipment main body so that synchronously import print data with clock.Printhead H1001 also has latch signal input H1123, be used for to latch cicuit H1117 input and latch signal (LT), also have heating signal input H1122, be used to import and enable driving element H1116 to drive the heating signal (HE) of electrothermal transducer H1103.Printhead H1001 among Fig. 1 adopts branch to drive n print member is divided into a plurality of and drive each piece.
Drive printhead H1001 according to following process.
Print data is synchronously imported and is held from print data input H1121 with the clock of being imported from clock signal input terminal H1120.Shift register H1118 sequentially keeps print data.When shift register H1118 kept print data corresponding to predetermined number of bits, latch signal was imported into latch signal input H1123.The latch cicuit H1117 of shift register H1118 next stage latchs print data according to latch signal."AND" circuit H1119 calculate the heating signal be input to heating signal input H1122 and the print data exported from latch cicuit H1117 between logical produc.Decoder (not shown) output block selection signal (BLE) drives n electrothermal transducer H1103 with branch ground."AND" circuit H1112 calculate block selection signal and the signal exported from "AND" circuit H1119 between logical produc.Print to carry out corresponding to discharging ink by the nozzle of the selected print member of being exported from "AND" circuit H1112 of signal.
The process of confirming status of electrically connecting between printhead H1001 and the inkjet-printing device is described below.In this manual, " normal status of electrically connecting " represent wherein printhead and printing equipment its contact site contact and do not have splicing ear or connect up in the state of any short circuit.
Printhead H1001 is connected to the balladeur train 102 of printing equipment main body shown in Figure 7.The contact portion (not shown) that is used to connect electric contact is set between balladeur train 102 and the printhead H1001.When printhead H1001 was connected to balladeur train 102, contact portion contacted with electrode section H 1104 on being arranged on printhead H1001, transmitting/to receive the various signals of telecommunication, thereby made printhead and balladeur train be electrically connected.As the unit that is used to confirm with the status of electrically connecting of printing equipment main body, printhead H1001 has as the connection status output circuit H1129 of characteristic features of the present invention and connection status output H1126 (CNO) from this circuit result of calculation to the printing equipment main body that export.Note connection status output circuit H1129 output logic signal (for example low-voltage signal of about 3.3V).
Reference numeral H1124 among Fig. 1 represents the earth connection terminal of electrothermal transducer H1103; H1113 represents the circuit from earth connection terminal H1124.
＜connection status output circuit 〉
Fig. 3 A illustrates the example of connection status output circuit H1129 of the present invention.Connection status output circuit H1129 comprises "AND" circuit H1129c, its computational logic signal LT, HE, CLK, DATA and provide and by resistance type voltage divider H1129a step-down and from the logical produc between the voltage of phase inverter H1129b output from VHT terminal H1125 (being used to apply the terminal of the driving voltage that is used for driving power MOS transistor etc.).Connection status output circuit H1129 also comprises "AND" circuit H1129e, and it calculates from VHT terminal H1125 and applies and by the logical produc between the voltage of resistance type voltage divider H1129a step-down and the voltage that provides from VH terminal H1130 (being used to apply the terminal of the driving voltage that is used to drive electrothermal transducer) and export by resistance type voltage divider H1129d step-down and by two phase inverter H1129g and H1129h.Connection status output circuit H1129 also comprises OR circuit H1129f, the logic between the output of its output of calculating "AND" circuit H1129c and "AND" circuit H1129e with.
Phase inverter H1129b and H1129g will import from the low height (perhaps will export be converted to from height low) that is converted to, because they have about low threshold voltage of 1.0 to 1.5V.This is when being used for driving the voltage (3.3V) of "AND" circuit of connection status output circuit for become at the voltage that is input to the connection status output circuit from VHT and VH terminal a little higher than (for example 4 to 7V), changes the output signal of CNO.In addition, have only special inverter (H1129b and H1129g) to have low threshold value, thereby when the voltage from VHT and VH terminal reached final voltage (for example 24V), output can be lower than less than the voltage of the breakdown voltage of "AND" circuit in the connection status output circuit (for example 7V or lower).Note, can change the threshold value of phase inverter by NMOS or the transistorized grid width of PMOS and grid length in the change phase inverter.
＜confirming electrical connection status process 〉
Fig. 3 B is illustrated in when confirming connection status between printhead H1001 and the printing equipment main body from printing equipment to be input to the signal of printhead and from the sequential chart of the signal (CNO signal) of connection status output H1126 output.
In T1 to T4, whether the input terminal of confirmation signal LT, HE, CLK and DATA correctly is connected.In T1 to T4, also be not transfused to (when the voltage from the input of VHT terminal was 0V, H1129b was output as height from phase inverter, and "AND" circuit H1129c can move) from the voltage of VHT terminal.
At first, the input of all these signals is set to height, makes CNO export high signal.If CNO output is not at this moment high, then there has been connection error at least one in LT, HE, CLK and the DATA terminal.In T1, when the printing equipment main body only to LT signal input terminal input low signal, and synchronously become lowly from the output signal of CNO and LT signal, then the LT signal input terminal is correctly connected.The printing equipment main body affirmed is from the output signal of CNO, thus the connection status of definite LT signal input terminal.
In T2 to T4, confirm individually according to identical mode whether these signal input parts are connected.
After printing equipment is based on the correct connection of output signal confirmation signal input quilt from CNO among the T1 to T4, utilize the connection status output circuit to confirm that high pressure applies the connection of terminal.Connect the characteristic features of confirming as this, not only can apply that terminal (VHT terminal or VH terminal) does not connect and when opening at high pressure, and can when being shorted to another terminal (the logical signal terminal that for example has low breakdown voltage) owing to certain is wrong, this terminal confirm whether connection status is normal.At first, apply voltage, to drive driving element from the VHT terminal.Compare slow (the msec order of magnitude) from the leading edge of the voltage of VHT terminal or VH terminal input with the voltage change speed (the nsec order of magnitude) of logic circuit, because the capacitor (not shown) that for example is arranged in the balladeur train 102 of printing equipment need be recharged so that apply stable voltage to type element.Suppose from the voltage of VHT terminal or the input of VH terminal and suddenly reach high voltage (24V).If be short-circuited when confirming electrical connection status, then printhead or printing equipment may be damaged.But in the device of this embodiment, voltage rises as mentioned above more lentamente.Therefore, confirm the connection status of VHT terminal or VH terminal when lower voltage, even short circuit has wherein taken place, this lower voltage also damages printhead or printing equipment hardly.If when confirming electrical connection status, confirm to have taken place unusual, then can protect printhead and printing equipment to avoid damaging by power cutoff immediately.Preferably when lower voltage, carry out the affirmation of the connection status of VHT terminal or VH terminal.But, when these terminals for example are shorted to logic signal input end, when the voltage identical, do not produce potential difference, and can not carry out enough affirmations with logical signal.In order to prevent this point, this embodiment adopts permission to determine the correct design that connects when the voltage than the high predetermined value of voltage of logical signal is imported into VHT terminal or VH terminal.Specifically, when the voltage from VHT terminal or the input of VH terminal is higher than voltage (for example 3.3V) that is used to drive the logic circuit on the printing head component substrate and the general breakdown voltage (for example 7 to 8V) that is lower than logic circuit, can confirm connection status.In particular, be provided with like this, make to begin normally to be applied to VHT terminal or VH terminal at voltage, and the voltage that is applied is when for example reaching 5V, printing equipment is confirmed connection status.In addition, determine divider resistance, make to have reached when driving the necessary final high voltage of type element (for example 24V), by dividing potential drop and be imported into the breakdown voltage (for example 7 to 8V) that logic circuit becomes and is lower than logic circuit with the voltage of the connection status of confirming VHT terminal or VH terminal at the voltage of being imported from VHT terminal or VH terminal.
Describe the divider resistance of VHT terminal or VH terminal below in detail.In this embodiment, the voltage of logic circuit is 3.3V, and the breakdown voltage of logic circuit is 7V, and the voltage that is used to drive type element is 24V.Divider resistance is set to when the voltage that is applied to VHT terminal or VH terminal is applied to the connection status output circuit this voltage is reduced to 1/4.
When the voltage of 24V was applied to VHT terminal or VH terminal, voltage was reduced to 1/4, made the voltage of 6V be imported into the logic circuit that is used for confirming electrical connection status, because this voltage is lower than the breakdown voltage 7V of logic circuit.Utilizing this setting, when the voltage that is applied to VHT terminal or VH terminal has reached 5V, is 1.25V by the voltage of divider resistance step-down.Therefore, phase inverter H1129b in the connection status output circuit and the threshold value of H1129g are set to 1.25V.In normal connection status, when being applied to the end box from printing equipment, 5V voltage changes from the output of connection status output circuit.This allows connection status to determine.If open-circuit condition has taken place,, there is not voltage to be applied to phase inverter H1129b and H1129g in the connection status output circuit even then the voltage of being exported from the printing equipment side reaches 5V owing to connecting fault yet.Therefore can determine that connection status is unusual.When VHT terminal or VH terminal open circuit, and the short-circuit of terminals of open-circuit condition is during to any one logic signal input end, and the voltage of 0.825V promptly 1/4 of 3.3V is applied to phase inverter H1129b or H1129g.In this case, phase inverter H1129b or H1129g be not with signal inversion, because threshold value is 1.25V.Therefore, can determine that connection status is unusual.Even VHT terminal or VH terminal are not open circuits, and be shorted to another terminal because certain is wrong, the voltage that also is not higher than threshold value is applied to the logic circuit that is used for confirming electrical connection status, this for example is because this voltage can not reach 5V owing to leakage current, perhaps reaches the constant time lag of 5V.Because these reasons can determine that the connection status of printing equipment side is unusual (connect the electric current that flows to VHT terminal or VH terminal when confirming and preferably be restricted, because more be easy to generate voltage difference between short-circuit condition and the normal condition).
Fig. 3 B illustrate when all logic signal input end, VHT terminal and VH terminal be connected all correct (OK) time, when the malunion of VHT terminal really when (NG), and when the VH terminal be connected to NG the time 3 kinds of different sequential.Input to these terminals is preferably carried out according to the order of logic signal input end, VHT terminal and VH terminal.When the connection of the input of logical signal (for example low-voltage of 3.3V) is identified, and is transfused to control and when driving type element, can prevents any driving of not expecting of type element by promoting VHT voltage that logical signal obtains then.In addition, when applying after this when being used for, can prevent any run-time error to the VH of type element energy supply voltage.
The two be connected of VHT terminal and VH terminal described in this embodiment.But, according to the position that electrically contacts between a printing equipment and box relation, damage that can be when only confirming that one of them terminal prevents the connector box effectively.For example, in some cases, if the connection status of a terminal is normal when the connector box, then the connection status of another terminal is based on the relation of the position between the terminal position of the terminal position of a box and printing equipment and become normal also reliablely.When being used to import the VHT terminal open circuit of the voltage that is used to drive type element, electrothermal transducer may maloperation, because driving of electrothermal transducer with being stabilized.Therefore, can obtain the effect that prevents that the box from damaging by only confirming the VHT terminal.
The logic of explaining among this embodiment is an example just, the present invention includes to have to comprise logic signal input end, be used to drive the feeder ear of electrothermal transducer and be used to drive any design of confirming electrical connection status unit of the feeder ear of driving element.
Fig. 2 illustrates according to the present invention from printhead and connects the sequence of printing end up to head substrate, printhead and printing equipment.
In step S10, printhead is connected to the balladeur train of printing equipment.In step S20, printing equipment is switched on.In step S30, check whether printhead normally connects.Specifically, whether the electrical connection between each input of affirmation printing equipment and printhead is normal in step S40.If it is undesired to be electrically connected, then in step S50, stop voltage being applied to printhead.In step S60, the unusual electrical connection of warning user.This warning be by open the LED that is arranged on the printing equipment or on host apparatus display message carry out, thereby be electrically connected improper to the user notification of printing equipment.If status of electrically connecting is normal, then printing begins in step S70.After the printing of expectation is performed, is printed among the step S80 and finishes.
Not only can take form according to printing equipment of the present invention such as the integrated or independent image output terminal of the such information processor of computer, and can take to make up the form of the copy device of reader etc., perhaps have and send and the form of the facsimile machine of receiving function.
Be that example has been described the foregoing description by device substrate with ink jet-print head.But embodiment also can be applied to and be used to use the printhead of heat-transferring method or the device substrate of subliming type printhead.
Although described the present invention, should be appreciated that to the invention is not restricted to disclosed exemplary embodiment with reference to exemplary embodiment.The scope of claims should be consistent with the most wide in range explanation, thereby contain all such modifications and equivalent construction and function.
Claims (13)
1. device substrate that is used for printhead, wherein said printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply the driving voltage that is used to drive type element; And logic circuit, described logic circuit is actuated to control described type element being lower than under the voltage of described driving voltage, and described device substrate comprises:
The connection status output circuit, it is based on applying the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment.
2. it is that second voltage that first voltage that is used for applying the voltage that is used to drive driving element applies end and is used to apply the voltage that is used to drive type element applies at least one of end that substrate according to claim 1, wherein said voltage apply end.
3. substrate according to claim 2, wherein said connection status output circuit output logic signal.
4. substrate according to claim 3, wherein said connection status output circuit comprises bleeder mechanism, be used for carrying out dividing potential drop to apply the voltage that end applies from voltage, and described connection status output circuit is exported the signal of status of electrically connecting between reflection printhead and the printing equipment based on by the voltage of described bleeder mechanism dividing potential drop.
5. substrate according to claim 4 also comprises signal input part, and its input will be provided to the logical signal of logic circuit,
Wherein said connection status output circuit is based on described logical signal, and output reflects the signal of status of electrically connecting between printhead and the printing equipment.
6. substrate according to claim 5, wherein said connection status output circuit comprises:
First phase inverter is used for carrying out anti-phase to this voltage when being surpassed threshold value by the voltage of described bleeder mechanism dividing potential drop;
Second phase inverter is used for carrying out anti-phase to the output signal from described first phase inverter;
First "AND" circuit is used for the logical produc result of output logic signal.
7. substrate according to claim 6, the output of wherein said connection status output circuit is based on from the output signal of described second phase inverter with from the signal of the output signal of described first "AND" circuit, as the signal of reflection status of electrically connecting.
8. substrate according to claim 7 also comprises output, and the signal that is used for being exported from described connection status output circuit outputs to printing equipment,
Wherein said connection status output circuit comprises:
The 3rd phase inverter is used for when being surpassed threshold value by the voltage of described bleeder mechanism dividing potential drop, with logical inversion;
Second "AND" circuit, its output applies after the dividing potential drop of end output signal from first voltage and from the logical produc result between the output signal of described second phase inverter, described second phase inverter receives the output signal from described first phase inverter, and described first phase inverter receives by described bleeder mechanism dividing potential drop and from second voltage and applies the voltage that end is exported;
OR circuit, its output is from the output signal of described second "AND" circuit and from logic between the output signal of described first "AND" circuit and result, the wherein said first "AND" circuit output logic signal and from the logical produc result between the output signal of described the 3rd phase inverter, described the 3rd phase inverter receive by described bleeder mechanism dividing potential drop and apply the voltage of end output from first voltage.
9. substrate according to claim 1, wherein said device substrate are the substrates that is used for ink jet-print head.
10. printhead that comprises device substrate, wherein said printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply the driving voltage that is used to drive type element; And logic circuit, described logic circuit is actuated to control type element being lower than under the voltage of described driving voltage,
Described device substrate comprises:
The connection status output circuit, it is based on applying the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment.
11. one kind of box has the ink container that contains ink and the printhead that comprises device substrate, described printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply the driving voltage that is used to drive type element; And logic circuit, described logic circuit is actuated to control type element being lower than under the voltage of described driving voltage,
Described device substrate comprises:
The connection status output circuit, it is based on applying the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment.
12. a use comprises the printing equipment of the printhead of device substrate, described printhead can disassemble and comprises a plurality of type elements from printing equipment; Voltage applies end, is used to apply in order to drive the driving voltage of type element; And logic circuit, described logic circuit is actuated to control type element being lower than under the voltage of described driving voltage, and described printing equipment comprises:
Input unit, be used to import the signal of being exported from the connection status output circuit, wherein said connection status output circuit is set on the described device substrate, and applying end from voltage when applying voltage to printhead, based on applying the voltage that end applies from voltage, the signal of status of electrically connecting between output reflection printhead and the printing equipment;
Determine device, be used for determining to be electrically connected based on the signal that is input to described input unit;
Control device is used for determining under the unusual situation of status of electrically connecting at described definite device, controls so that stopped to apply voltage to printhead before surpassing the breakdown voltage of logic circuit from the voltage that printing equipment applied.
13. device according to claim 12 also comprises aviso device, is used for determining that at described definite device circular is electrically connected unusual under the unusual situation of electrical connection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006327625 | 2006-12-04 | ||
| JP2006327625 | 2006-12-04 | ||
| JP2006-327625 | 2006-12-04 |
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| CN101200142A true CN101200142A (en) | 2008-06-18 |
| CN101200142B CN101200142B (en) | 2012-05-23 |
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|---|---|---|---|
| CN2007101620976A Active CN101200142B (en) | 2006-12-04 | 2007-12-04 | Element substrate, printhead, head cartridge, and printing apparatus |
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| US (2) | US7841678B2 (en) |
| JP (1) | JP5180567B2 (en) |
| KR (1) | KR100935739B1 (en) |
| CN (1) | CN101200142B (en) |
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| CN104015480A (en) * | 2013-03-01 | 2014-09-03 | 佳能株式会社 | Printhead board, printhead, and printing apparatus |
| CN103324067B (en) * | 2012-03-23 | 2018-05-01 | 富士施乐株式会社 | Detection device and method and image forming apparatus |
| CN112020436A (en) * | 2018-05-15 | 2020-12-01 | 惠普发展公司，有限责任合伙企业 | Fluid die with low voltage monitoring circuit including high voltage tolerant transistors |
| CN112571949A (en) * | 2019-09-27 | 2021-03-30 | 精工爱普生株式会社 | Print head drive circuit and liquid ejection apparatus |
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| JP5760701B2 (en) * | 2011-05-30 | 2015-08-12 | セイコーエプソン株式会社 | Printing device |
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| JP6878153B2 (en) | 2017-06-02 | 2021-05-26 | キヤノン株式会社 | Liquid discharge head, liquid discharge head cleaning method and liquid discharge device |
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| CN103324067B (en) * | 2012-03-23 | 2018-05-01 | 富士施乐株式会社 | Detection device and method and image forming apparatus |
| CN104015480A (en) * | 2013-03-01 | 2014-09-03 | 佳能株式会社 | Printhead board, printhead, and printing apparatus |
| US9308719B2 (en) | 2013-03-01 | 2016-04-12 | Canon Kabushiki Kaisha | Printhead board, printhead, and printing apparatus |
| CN104015480B (en) * | 2013-03-01 | 2016-06-15 | 佳能株式会社 | Head substrate, printhead and printing equipment |
| CN112020436A (en) * | 2018-05-15 | 2020-12-01 | 惠普发展公司，有限责任合伙企业 | Fluid die with low voltage monitoring circuit including high voltage tolerant transistors |
| CN112020436B (en) * | 2018-05-15 | 2022-04-19 | 惠普发展公司，有限责任合伙企业 | Fluid die with low voltage monitoring circuit including high voltage tolerant transistors |
| US11325370B2 (en) | 2018-05-15 | 2022-05-10 | Hewlett-Packard Development Company, L.P. | Fluidic die with low voltage monitoring circuit including high voltage tolerant transistor |
| CN112571949A (en) * | 2019-09-27 | 2021-03-30 | 精工爱普生株式会社 | Print head drive circuit and liquid ejection apparatus |
| CN112571949B (en) * | 2019-09-27 | 2022-07-22 | 精工爱普生株式会社 | Print head drive circuit and liquid ejection apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100935739B1 (en) | 2010-01-06 |
| US20110032295A1 (en) | 2011-02-10 |
| US20080180480A1 (en) | 2008-07-31 |
| CN101200142B (en) | 2012-05-23 |
| KR20080051096A (en) | 2008-06-10 |
| JP2008162272A (en) | 2008-07-17 |
| JP5180567B2 (en) | 2013-04-10 |
| US7841678B2 (en) | 2010-11-30 |
| US8057000B2 (en) | 2011-11-15 |
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